package com.hengli.aspect;

import com.hengli.annotation.AutoFill;
import com.hengli.constant.AutoFillConstant;
import com.hengli.context.BaseContext;
import com.hengli.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面：实现公共字段自动填充
 *
 * @author ljx
 * @date 2024/3/24 9:48
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    /**
     * 切入点
     */
    //execution锁定了mapper下的所有方法 && @annotation满足注解，直接加@annotation会影响效率
    @Pointcut("execution(* com.hengli.mapper.*.*(..)) && @annotation(com.hengli.annotation.AutoFill)")
    public void autoFillPointcut() {
    }

    /**
     * 前置通知
     *
     * @param joinPoint
     */
    @Before("autoFillPointcut()")
    public void autoFill(JoinPoint joinPoint) {
        log.info("公共字段自动填充...");

        //获取到当前被拦截的方法上的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方法上的注解对象
        OperationType operationType = autoFill.value();//获得数据库操作类型


        //获取到当加被拦截的方法的参数实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) {
            return;
        }
        Object entity = args[0];

        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();


        //根据当前不同的操作类型，为付应的属性通过反射来赋值
        if (operationType == OperationType.INSERT) {
            //为4个公共字段赋值
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射为具体对象属性赋值
                setCreateTime.invoke(entity, now);
                setUpdateTime.invoke(entity, now);
                setCreateUser.invoke(entity, currentId);
                setUpdateUser.invoke(entity, currentId);
                log.info("新增公共字段自动填充成功！");
            } catch (Exception e) {
                e.printStackTrace();
            }
        } else if (operationType == OperationType.UPDATE) {
            //为2个公共字段赋值
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射为具体对象属性赋值
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);
                log.info("修改公共字段自动填充成功！{}",entity);
            } catch (Exception e) {
                e.printStackTrace();
            }

        }

    }
}